Telegraphic repeater.



NrrEn STATES PATENT OFFICE.

STEPHEN DEIELD, OF STOCKBRIDGE, MASSACHUSETTS, ASSIGNOR TO JOHN J. GHEGAN, OF N WARK, NEW JERSEY.

TELEGRAPHIC REPEATER.

Patented Dec. 12, 1905.

Application filed December 31, 1904. Serial Inn 239,073.

To all ZUhOTH/ it may concern:

Be it known that l, STEPHEN D. FIELD, a citizen of the United States, and a resident of Stockbridge, Berkshire county, Massachusetts, have invented Improvements in Telegraphic Repeaters, of which the following is a specification.

This invention relates to automatic telegraph-repeaters. Its novelty consists in a new arrangement of the local circuits, together with means for accelerating the movement of the relay-armatures, thus enabling them to make a prompt response when working on a high adjustment, and so eliminate the error, often found in apparatus of this class, known as a false break.

In organizing the apparatus I utilize the back-stop of the relays to complete the local circuit. The magnets of the repeating sounders, transmitters, or other circuit-controllers are differentially wound, and the local current traverses one branch of the magnet con- -i nuously, the other branch being controlled )ythe relay-contact. When the relay is on ts back contact, both coils of the local mag- :t are in action, the magnetism in the local gnet is neutralized, and the sounder or cir- 't-controller opens. The instant that the Ly-armature begins to leave its back-stop a neutralizing effect is destroyed and the maining constantly-closed coil in the local nagnet comes into play, causing the magnet ;o attract its armature. By this arrangement .he loss of time due to the instant'occupied )y the relay armature in its excursion is largely eliminated, the signal commencing at the instant the relay-armature commences its xcursion and not at the finish of the same, .ts is the case in. most forms of existing apparatus.

Another feature of merit consists in the fact that in this circuit arrangement sparking at the relay contact-points is entirely eliminated, the local magnet-windings mutually reacting on each other with the above result.

To accelerate the movement of the relayarmature, a condenser is provided, said condenser being in circuit with more or less of the relay-windings and with the line-contacts of the repeating sounder. By such arrangement when the line-contacts are open the condenser receives a charge from the line-battery,

and closure of the line-contacts sends this charge through more or less of the relaywindings, the effect being to bring the relayarmature up with a quick sharp action, even though its retractile springbe strained to a point farin excess of its normal value.

Having thus in a general way outlined the system, reference is bad to the drawings for a more clear description of its operation.

Figure 1 is a diagrammatic arrangement of telegraph instruments and lines, illustrating my invention. Fig. 2 is a similar diagram, but with certain parts of the instruments in different positions.

Referring to the figures, A A represent the relays connected in the main lines; .B B, the armature's of said relays; C C, condensers in shunt-circuits, including one or more windings of the relays A A and the line-contacts of the repeating Sounders; D D, the. backstops for the relay-armatures, at which points the local circuits are controlled by the relays; E E, difierentially-wound sounder-magnets; F F, the levers of the sounder-magnets, and G G the batteries in the local circuits, which batteries are always in closed circuit with onehalf the coils of the magnets E E.

The current from the east battery passes in at 1 through coils 2 3 of relay A, line 4, spring-contact points 5 6, and line 7 back to the east battery or to the. west line. Con denser U is shown in the shunt-line 8 from the coils of magnet A. to the main line 7. Cur rent from battery G normally flows through coil 9 of the differentially-Wound magnet E; but when the local circuit isclosed the current from battery G divides and also flows through coil '10 of magnet E, line 11, to contact-points 12 13, through lever 'F, line 14, armature B, contact-point D, and line 15 back to battery Gr. Current from the north bat: tery passes in at line 16 through coils 17 and 18 of relay A,Vthrough line 19 to spring-contact 2O 21, and line 22 back to the north battery or the south line. Current from the battery G normally flows through coil 23 of differentially-wound magnet E; but when the local circuit is closed this current divides and also flows through coil 24: of magnet E, line 25, contact-points 26 27, lever F, line 28, lever B, contact-point D, and line 28 back to battery Gr. Condenser C is in the shunt-line 30 from the coils of magnet A to the main line 22. v

Fig. 1 represents the apparatus in a state of rest, at which time the relay-armatures B B will be on their front stops and all the sounderline and local contacts closed. If a key on the eastern line is opened, the effect will be to interrupt the flow of current through the coils 2 and 3, surrounding relay-magnet A, and relay-armature B will fall away and contact with point D. The positions of the parts of the apparatus when a key on the eastern line is open is represented in Fig. 2. A local circuit will now be established, and current from battery Gr will flow through both branches 9 and 10 of sounder-magnet E, an equal amount in each direction. This will result in a neutralization of magnetism in the magnet E.

Lever F will rise, first separating local contacts 26 27, next breaking the northern line at spring-contacts 2O 21, and so repeating the break from the eastern line to the northern circuit. The separation of local points 26 27 breaks the local circuit controlled by the northern relay A, thus preventing this northern relay from influencing its sounder. When contact at 20 21 is broken, condenser C receives a charge from the line-battery of the northernline, since coil 17 of relay A, connected to the northern line, is in circuit with condenser C. When the eastern line closes, the neutralization due to coil 10 is removed, owing to the separation of the armature B from the contact-point D, and coil 9 energizes magnet E. This draws lever F down, closing spring-contacts 2O 21, when the condenser C is discharged through northern relay-coil 18.

This causes an instantaneous movement of armature B, which leaves contact-point D, so that by the time contact-points 26 27 close the local circuit of the northern line has already been opened at D, thus preventing a back kick from the northern relay. If, however, the northern line is broken, there will not be enough energy traversing the coils 17 and 18 to retain the armature B at its front stop. Consequently the armature B will fall back, and there will be an exact reverse cycle of operation transferring the break from the northern line to the eastern circuit.

From the foregoing it will be seen that the repeater comprises in duplicate a main line, a relay connected therein, a circuit-controlling device, and a local battery-circuit; that the circuit-controlling device of one set operates first the line-contacts of the opposite circuit and then the contacts of the opposite local circuit, and that during the instant between the closing of the line-contacts and the local contacts the condensers act. This, with the fact that the local circuits are operated to prevent action of the sounder not repeating at the beginning of the movement of the relayarmature instead of at the end of that motion, assures a quick response and prevents false breaks;

I claim as my invention 1. A telegraphic repeater comprising a duplicate, a main line, arelay connectedrtherein, a circuit-controlling device actuated by said relay and controlling line and local contacts of the opposite set, and adapted to operate the line-contacts before the local contacts, and means for accelerating the movement of the relay-armaturewhen the opposite controlling device closes the line-contacts.

- 2. In a telegraphic repeater, two main lines, a relay connected in each line, a circuit-controlling device actuated by each relay-armature and its back-stop, and means for accelerating the movement of the relay armatures.

3. A telegraphic repeater comprising, in duplicate, a main line, a relayconnected therein, a circuit-controlling device actuated by the relay and controlling line and local contacts of the opposite set, and condensers in shunt with a winding of the relay and the line-contacts.

4. In a telegraphic repeater, a relay, a oircuit-controlling device provided with a differentially-wound magnet, a local battery and a divided circuit from said battery, one division of said circuit being normally closed through one of the windings of the said magnet, and the other division including the other winding of the magnet, and adapted to be controlled by said relay.

5. A telegraphic repeater comprising, in duplicate, a main line, a relay connected therein, a dilferentially-wound repeating sounder, a local battery-circuit divided through the two windings of the sounder-magnet, one division of the circuit being normally closed and the other controlled by the said relay and the opposite sounder.

6. A telegraphic repeater comprising, in duplicate, a main line, a relay connected therein, a difierentially-wound repeating sounder, a local battery-circuit divided through the two windings of the sounder-magnet, one division of the circuit being normally closed and the other controlled by the armature of the said relay and its back-stop, and by the opposite sounder.

7. A telegraphic repeater comprising, in duplicate, a main line, arelay connected therein, a repeating device having a diiferentiallywound magnet controlling line and local contacts of the opposite set, a local battery-circuit divided through the two windings of the said magnet, one division of the circuit being normally closed and the other controlled by the opposite repeating device and by the relay-armature and its back-stop, and a condenser in shunt-circuit with the winding of the relay and its line-contacts.

IIS

'8. A telegraphic repeater comprising, in In testimony whereof I have signed my name duplicate, a main line, a relay connected thereto this specification in the presence of two sub in, a differentially-Wound sounder controlling scribing Witnesses. the opposite line-contacts and opposite local STEPHEN D. FIELD.

5 circuit-contacts. and a condenser in shunt with the Winding of the relay-armature and the linecontacts controlled by the opposite sounder.

Witnesses:

LOUIS H. FENN. DANIEL B. FENN.

It is hereby certified that in Letters Patent No. 806,884, granted December 12. 1905, upon the application of Stephen D. Field, of Stockbridge, Massachusetts, for an improvement in Telegraphic Repeaters, an error appears in the printed specification requiring correction, as follows: On page 2, line 68, the letter a following the word comprising should read in; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofifice.

Signed and sealed this 26th day of December, A. D., 1905.

[SEAL.] F. I. ALLEN,

W Mm

'8. A telegraphic repeater comprising, in In testimony whereof I have signed my name duplicate, a main line, a relay connected thereto this specification in the presence of two sub in, a differentially-Wound sounder controlling scribing Witnesses. the opposite line-contacts and opposite local STEPHEN D. FIELD.

5 circuit-contacts. and a condenser in shunt with the Winding of the relay-armature and the linecontacts controlled by the opposite sounder.

Witnesses:

LOUIS H. FENN. DANIEL B. FENN.

It is hereby certified that in Letters Patent No. 806,884, granted December 12. 1905, upon the application of Stephen D. Field, of Stockbridge, Massachusetts, for an improvement in Telegraphic Repeaters, an error appears in the printed specification requiring correction, as follows: On page 2, line 68, the letter a following the word comprising should read in; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofifice.

Signed and sealed this 26th day of December, A. D., 1905.

[SEAL.] F. I. ALLEN,

W Mm

Correction in Letters Patent No. 806,884.

It is hereby certified than in homers Patent No. 806,884, granted December 12. 1905, upon the application of Stephen D. Field, of

Smckbridge Massachusetts, for an improvement in Telegraphic Rcpvmvrsfi' an (error :Lppcars in the printed specification requiring correction, as follows:

(in pngv 2. lino US ([10 lower *a" following the word comprising should read in; and iiml llw mid Lotion Patent should be rvad with this correction Lin-rein that tin mum- |n;| conform [0 NH raw-[mi of' (in (:a'ssin thv Patent Ofiicc.

Signed and scaled this 26m (my of ('(fllllhfll, A 1),. ISM").

[SEAL] F.

I ALLEN.

(,mnmixm'oner of Patents. 

